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From: Luke Dashjr <luke@dashjr.org>
To: bitcoin-dev@lists.linuxfoundation.org,
Rusty Russell <rusty@rustcorp.com.au>
Date: Tue, 16 Jan 2018 04:15:54 +0000
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Cc: Russell O'Connor <roconnor@blockstream.com>,
Kalle Alm <kalle.alm@gmail.com>
Subject: Re: [bitcoin-dev] BIP 117 Feedback
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On Tuesday 16 January 2018 1:06:14 AM Rusty Russell via bitcoin-dev wrote:
> "Russell O'Connor" <roconnor@blockstream.io> writes:
> > However, if I understand correctly, the situation for BIP 117 is entirely
> > different. As far as I understand there is currently no restrictions
> > about terminating a v0 witness program with a non-empty alt-stack, and
> > there are no restrictions on leaving non-canonical boolean values on the
> > main stack.
>
> BIP-141: "The script must not fail, and result in exactly a single TRUE
> on the stack." And it has long been non-standard for P2SH scripts to
> not do the same (don't know exactly when).
This doesn't affect the alt-stack (it's a completely separate stack).
> The rule AFAICT is "standard transactions must still work". This was
> violated with low-S, but the transformation was arguably trivial.
>
> OTOH, use of altstack is completely standard, though in practice it's
> unused and so only a theoretical concern.
I'm not aware of a single standard/BIP that uses the altstack at all.
Luke
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